Allow dependabot PRs without manual changelog entry

.github/workflows/pull-checks.yml

@@ -23,11 +23,21 @@ jobs:
                     lines=$(git diff HEAD~1 -- CHANGELOG.md | wc -l)
                     echo "::set-output name=lines::$lines"
 
+            -   name: Get all changed file names
+                id: file-names
+                run: |
+                    lines="$(git diff HEAD~1 --name-only)"
+                    echo "Changed files:"
+                    echo "$lines"
+                    cnt="$(echo "$lines" | grep -v '^package-lock.json$' | wc -l)"
+                    echo "That are $cnt changed files."
+                    echo "::set-output name=num::$cnt"
+
             -   name: Error if the number of diff lines is zero
                 run: |
                     echo "::error file=CHANGELOG.md::There was no change in the changelog detected. Please fill in a valid entry into that file."
                     exit 1
-                if: ${{ steps.diff.outputs.lines == 0 }}
+                if: ${{ steps.diff.outputs.lines == 0 && steps.file-names.outputs.num > 0 }}
 
     appinfo:
         name: Check for matching app info file

CHANGELOG.md

@@ -3,6 +3,8 @@
 ### Fixed
 - Refactor the code for image handling to make it testable
   [#933](https://github.com/nextcloud/cookbook/pull/933) @christianlupus
+- Allow merging of PRs from dependabot with only changes to package-lock.json
+  [#952](https://github.com/nextcloud/cookbook/pull/952) @christianlupus
 
 ### Documentation
 - Enhanced the user documentation by adding some starter's information